I don't think you cannot contact this bank manager as it is not a retail branch. Their phone number is (212) 809-5310. I think if you call and ask for a certain department, you may be able to talk to someone.
32 Hill Street Newry
Southgate Street, Gloucester
Address of Threadneedle street branch
This sort code is being used by Barclays Bank. It is assigned to the Fleet Street branch.
This sort code is being used by Barclays Bank. It is assigned to the Benet Street branch in Cambridge.
Barclays Business centre, Manchester, Mosley Street
Barclays Bank High Street LEWES East Sussex
BARCLAYS BANK, 45 Market Street, Wymondham, Norfolk, NR18 0AL
Barclays Bank, 62 High Street, Cosham, Portsmouth PO6 3DB
32 Hill Street Newry
Southgate Street, Gloucester
Terminus Street, Harlow, Essex
Barclays Bank, 2 High Street, Salisbury, Wiltshire, SP1 2NP‎ - 0845 755 5555‎
Barclays Bank, 60 Union Street, Bristol.
Not easy to find - I have an account at the same branch, my cheque book mentionss Kingsland High Street so I used Barclays' branch locator and this came up:3/5 Kingsland High StreetLondonE8 2JT
Barclays Bank, 25 High Street, Coventry, CV1 5QZ. Sort Code: 20-23-55
2 high street, chelmsford, essex, cm1 1bg